Dental chair



(No Model.) A 2 Sheets-Sheet 1. ,E. P.. sT-ILBS.

DENTAL CHAIR.

No. 294,286. Patented Peb.z6,-18"84.

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UNITEDA STATES PATENT GFFICE.

f EDMU'ND P. STILES, AUSTIN, TEXAS.

'DENTAL CHAIR,

SPECIFICATICN forming part of Letters Patent No. 294,286, dated February 26, 1884.

Application filed April 24,1'883, (No mpaei.)

10 are detail views of parts entering into thel construction of the swiveled post for the chair, and are hereinafter more fully described. Fig. ll is a detail perspective view of the foot-rest portion of the-chair, Figs. 12, 13, 14, and 15, detail views of parts pertaining to said foot-v rest attachment. Fig. 1G is a perspective view of the bracket holding the head-rest; Fig. 17 an under side view ofthe head-rest. Fig. 18 is a top View of the arm-support of the chain, Fig. 19, a vertical cross-section' of the same,` showing its manner of attachmentto the chairbraces, the line c c, Fig. 1, indicating the plane of section. Fig. 20 is a detail top View ofthe arm for holding the spittoon; Fig. 21, .a horizontal section of one-half of the tubular post that supports the chair, and Fig. 22 a vertical longitudinal section thereof.

This invention relates to several improvements in the construction of dental chairs,

' tions of parts that pertain to the several portions of thev chair, and that -are hereinafter more fully described.

A-My new chair is in every respect portable,

can be readily taken apart and folded into a small compass, and is adaptable to all the ne!l cessities of a dentist, being at lthe same time very light. It possesses all the movementsiof the most perfect chair,excepting the lateral oscillatory movement.

In the accompanying drawings, A represents the foot of the chair. The same is formed of only two bars of wood, a and b, that cross each other beneath the center or vertical axis of a1 vertical tube, B, lwhich constitutes the i spond in that respect with the section ofthe tube B.

. said tubing B, each wing dr fitting over the corresponding portion of the bar c or b of the foot A, which is beneath it, so that thus the said two bars that constitute the foot are properly braced and spaced, and also properly joined to the superstructure of the pedestal. Suitable bolts are added, to render the connection between the bars of thefoot and the pedestal more secure.

Fig. 9 shows a top view of the part of the tube B that h as the wings d. The part of the tube B which is shown in top view, Fig. 9, and in bottom view in Fig. 10, and which has been described as part and parcel of the vertical tube B, may be a separate short metallic socket, into which the lower end of the tube B is received, and in that case thetube B may be made of wood; but I donot wish to limit myself to the making of the lower winged portion that has the extensions d either separate from or in one piece with the tube B, nor to particular material. The bolt-s e, whichv may be used'to render the connection between the bars of the foot A and the superstructure of lthe pedestal more rigid, may extend, as is indicated in Fig. 1, through a plate, f, which is at the vbottom of the raised center of the foot, vertically upward either through or alongside the cylinder B, and through a'plate, g, which rests on top of the cylinder B. Of course the plate g is of annular form, to correi general crossrests, when the post D is inserted into the tube B, on a' cable, fi, of which one end` is securedlin. the upper portionv of the tube B, on the inner side of said tube, while the .otherV end passes -atabout' the same level through an opening formed on the other side of the tube,

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where it passes over a friction-roller, j, and then is securedto a windlass, l', all as more generally indicated in Fig. 1. This windlass l; has its bearings in a strap, l, which is rigidly attached to the tube B, as shown. By turning the windlass lr, which has a proper click attachment to lock it in the position desired, the cable will be moved so as tolift or lower the post D and hold it in the position desired, thus adjusting the entire chair-body to the desired height. The cylinder B, in order to receive the vertical parts ofthe cable f1 within it, is grooved-vertically on opposite sides of its interior, as is lnore clearly shown in Figs. 2l and 22, Fig. 2l being a. cross-seetion of one halt' of the cylinder B. and showing one interior groove, and Fig. 22 being a vertical section ol" the same half ot' the cylinder B, showing the cable in said groove to the point of exit.

Fig. 5 is a vertical section through lhelower part of the post D; Fig. (i, a s1de view of the lower part of the post D; Fig. 7, a detail face view of the roller It and its connections; and Fig. 8 is a plan or top view of the tube B, showing the plate -f/ and bolts e in their proper relative positions, and showing the post D in horizontal section. The lower end ot' the post D is hollowed out to receive the spindle m of the bloek E, that carries thc roller h. It will be seen that when the block E rests on the cable fi, the post D, resting on the pivot m ofthe block E, will be l'ree to rotate horizontally around the spindle in, thus permitting the chair to be turned horizontally to any desired extent; but a set-screw, n, which is indicated by dotted lines in Fig. 1, and which passes through the tube B and bears against the post D, will serve to lock the chair in the desired horizontal position to which it may have been turned. The cable i, at the end which is definitely secured to the cylinder B, is secured by a knot tied in it, as indicated in Fig. l, or in any other suitable manner. It will be perceived from Figs. 5 and 6 that the spindle m of the block of the roller his slightly longerthan the recess or socket in the lower end ol the post D, so that the post D really rests upon the upper end of the spindle ym.. The block E, in which the roller h is hung, has small notches o eut out at each side, which notches allow the cable li to pass, without causing undue frictional contact, from the grooves of the cylinder B into the groovcd part ofthe roller' 7L. The upper end of the post D enters a lnetallie socket, F, of which Fig. 4 is a perspective View. Upon the wings p of this socket F, and between the upwardly-projecting lugs q thereof, is placed a horizontal bar, G, of wood or other substance, which at its ends is turned or otherwise provided with projecting trunnions r, that enter proper bearings or sockets, s, which are attached to the under side of the seat H of the chair-body. On the trunnions r the chair-body can be swung into any suitable inclined position longitudinally.

VWith the socket-piece Fis also connected a bracerod, t, which is pivoted to another ear, a, that extends backward from the socket F. The rod tpasses through a clamp, e, that is attached to the rear portion of the chair-seat H. By the thumb-screw of this clamp t the inclined position to which the c-hair may have been adjusted by turning it on the trunnions r can be maintained.

I is the back of the chair, formed by preference ot' three vertical bars, yw, x, and y. (See Fig. 2.) The side bars, w and y, are at their extremities properly braced together by horizontal or diagonal braces, while the middle bar, x, is a strengthening appliance or brace. The upper part of the vertical brace .tis mortised out, as indicated by dotted lines in Fi". l, so as to form a sheath for the rod z, that can be raised or lowered in said sheath at pleasure, and clamped inposition by a small setscrew, a2. The rod ,e serves to support the head-rest J. This head-rest J, of which there is more plainly shown a bottom View in Fig. 17, contains at -its bottom a cross-slot, b2, and rests on an angle-iron, d, of which and of whose connections a perspective view is shown in Fig. 16. The upper wing of this angle-iron d is slotted longitudinally, and through this slot and into the cross-slot Z" of the head-rest J enters a bolt, el, having a thumb-nut, so that wh en the head-rest has been adjusted by clamping the thumb-nut it will be held to the angleiron d in any desired position. The lower wing of the angle-iron d is pivoted to the up per end of the rod s, the pivotal connection being such that it will be capable ot' being rig idly fastened by turning a nut, fi, on the screwpivot ff, that establishes said connection between ihe parts f: and d?, all as indicated in Fig. 16. Thus by clamping the pivot g2 the inclination of the head-rest may be fixed at pleasure. The middle of the bolt g is preferably square and closely iitted in the square opening through the shorter arm of th'e angle-iron d2, thus necessitating the simultaneous movement ofthe bolt g2 and angle-iron el, and the rigidity ofthe one with the other.

As far as the bolt et' is concerned, it is quite evident that its head rests on the plate h,which is secured to the under side of the head-rest J, and which plate has the cross-slot b2, as shown in Fig. 1T. The face of the headrest may be upholstered in suitable manner.

The uprights u and y, which forni the sides of the chair-back I, have attached to their faces iron plates l1', which are more clearly iudicated in Figs. 2 and In each of these iron plates are formed angular or analogous openings, and behind each of these openings is a recess or cavity formed in the face of the chairback, as more clearly shown in Fig. 3. These plates i, with their apertures and with the corresponding recesses in the chair-back, are for the purpose of supporting the adjustable childs seat L. This seat L carries near each end a plate, j, with vertically-projecting per- IOO IIO

' forated ears k2. V(See Fig. 3:) Through-these r iso that it can bereadily detached.

plates i2, and thereupon entirely disconnectleast whenever desired. To the inner face of lthe arm-rest O is first slipped out, and then ears extend pins that are-formed at the endsl of av'V- shaped bracket, M. The upper end of this bracket'M hasa downwardly-projecting hook, Z2, which is adapted 'toenterthrough vone of the apertures of the plate i2 and engage with the rear side of the platefil, as indicated in Fig. 3. Meanwhile, for greater security, the rear end of the plate `7'2 also enters into one of the apertures of -plate i2, as `also indicated in Fig. 3. Thus by means of these two brackets M M the childs seat L can beheld at any desired elevation on the chair-back I and when the childs seat is to be removed it can readily be taken oi't" by tilting its 'front end'slightly upward, disengaging the hooks Z2 from the ing the childs seat.` The brackets M will then readilyfold upon the childs seat, and the entire attachment can be putout of the way-until again required for use.

The chair-back I is hinged at m2 to the chair-seat H, and is kept in position by the side braces, N, each of which is fastened at its front end to the chair-seat AIrI by -a thumbscrew, n?, and at its rear end by a similar thumb-screw, a2, to the chair-back, as shown,

'Ihe arm-rest Ois fastened to the brace N by the means more clearly shown in Fig. 19, which is a crosssection on the line c c of Fig. 1. Of course, when speaking of the arm-rest O and brace N, it is evi-'dent that the chair has two such arm-rests and two such braces, at

the arm-rest O is rigidly fastened a metallic plate, o2, the edge of which'forms, with a rabbeted portion of the arm-rest, a groove at top and bottom thereof. 'The brace Nis recessed on its outer face to receive the plate o2, and partly overlapping this recess is a continuous plate, p2, fastened vto the outer face of the brace N, so that its inner edges can enter into the grooves of the arm-rest .0, overlapping partly the plate o2 at the top and bottom, all as indicated in Figs. 1 and 19. By this means of attachment the arm-rest is very rigidly held to the brace N 5 and yet, whenever it is desired to take it off, it is only necessary to slip it out by drawing it forward from between the plates pi. In packing the chair,

the brace is detached, and the two' canl be packed flat side by side. 4

The foot-rest P is composed of three sections, Qz, r2, and s2, and is more clearly shown by perspective view in Fig. 11. These sections are so 1 arranged that they can fold intoV one another in such a manner that the space `the seat, and then locking-it by a wedge, 02, was more clearly indicated by the detail figures, 12, 13, and 14. The middle section oriioor,

occupied lby them will ybe little greater than that occupied by the largest section, if it werepacked alone; or the sections may be entirely separated whentobeV packed for transportation. The section q2 is the upright section of wedges-or otherwise in-sockets attached to `the uprights q2, andenter with their horizontal parts suitable sockets formed in or fastened to the seat H. 'One way of `fastening the brackets t2 to the seat is by forming a recess in the face ofthe bracket, passing this recessed portion through a clip, uwhich is secured to r?, of the foot-rest is formed by mortising light slats intothe frame of that section at distances of about half an inch apart, so that only their edges come in. contact with the foot. This arrangement gives strength and lightness, and prevents the accumulation of dust on the footrest.

`view on an enlarged scale, and which bracket its shank is hung in ears x2, that project upward from the seat of the chair. The spittoon should "be made of flexible rubber, so that in packing it will fold dat. Y

i I claim-V The adjustment of the foot-rest-may be effected `by suitable ratchets, wz, (see Fig. 15,)

- 1. The `dental chair, combined with the downwardly-proj ecting post D, swiveled block E,`roller h, longitudinally-grooved pedestalcylinder B, cable i, roller j, and windlass k,

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substantially as described, the cable i passing j Y through two apertures that pierce the cylinder B, and resting in the grooves of said cylinder, substantially as specified.

2. The clamp F, having ears p and'lugs q, combined with the bar G, having trunnions r, and with the post D, base-support AB, and

seat H, having bearings s, substantially as and forthe purpose spe'ciiied.

3. The childs seat L, combined with the plates jz, having upright perforated ears. k2, and with the detachable brackets MYM, Yhaving IIO horizontal pins that extend through said ears, 

